Many owners Nissan Qashqai and other brand models experience a sudden engine stop or inability to start, accompanied by the appearance of the Check Engine indicator. One of the most common and critical problems is the error P0335, which indicates a malfunction in the crankshaft position sensor circuit. Without the correct operation of this element, the electronic control unit cannot synchronize fuel supply and spark generation, which makes the vehicle impossible to move.
Ignoring this malfunction can lead to serious consequences, including failure of expensive engine components. The sensor plays the role of an “eye” for the car’s computer, and if it goes blind, the system goes into emergency mode or completely blocks the start. It is important to understand that the problem may lie not only in the sensor itself, but also in the wiring, or in mechanical damage to the flywheel ring gear or crankshaft pulley.
The essence of the malfunction and the operation of the sensor
The crankshaft position sensor (CPS) is an inductive or magnetoresistive element that senses the position and speed of rotation crankshaft in real time. By car Nissan it is usually located at the bottom of the engine, near the crankshaft pulley or on the transmission housing. The ECU receives a signal from each tooth on the pulley and determines the exact moment to inject fuel and supply a spark.
When does the code occur? P0335, this means that the control unit does not receive a signal from the sensor for a certain time or the signal is completely absent. This does not always indicate a breakdown of the sensor itself. Sometimes the problem lies in an open circuit, short circuit, or contamination of the sensing element with metal shavings. In such cases, replacing the part may not help unless the root cause of the failure is resolved.
Most often this error appears on engines of the MR20DE and QR25DE series installed on Qashqai and X-Trail. She also appears on Teana and Almera. If you notice that the car starts and stalls, or the starter turns, but the engine does not engage, this is the first sign that the synchronization system has lost data on the position of the pistons.
The main reasons for error 0335
The causes of the failure can be divided into three main groups: problems with the sensor itself, wiring faults and mechanical damage. Most often, it is the sensor itself that fails due to overheating or natural wear. However, you should not rush to buy a new spare part, as the reason may be as simple as oxidation of the contacts or a broken wire.
- 🔥 Sensor overheating due to proximity to hot engine elements.
- 🔌 Break or short circuit in the wiring harness going to the sensor.
- ⚙️ Contamination of the sensor head with metal shavings or dirt.
- 🦠 Oxidation of contacts in the connection connector.
Particular attention should be paid to the mechanical part. If the crankshaft pulley ring gear is missing a tooth or is severely deformed, the sensor will not be able to read the signal correctly. In this case, the error will appear periodically, especially at certain engine speeds. It is also worth checking the gap between the sensor and the pulley, as it must strictly meet factory specifications.
⚠️ Attention: Never install the sensor without checking the integrity of the teeth on the crankshaft pulley. If there is a damaged tooth, the new sensor will also quickly fail due to an unstable signal.
Symptoms and diagnosis of malfunction
Symptoms of P0335 usually include a sudden loss of power and an inability to start the engine. You may notice that the tachometer needle does not rise above zero upon startup, which confirms that there is no signal that the shaft is rotating. Sometimes the car may stall while driving, especially when stopping or changing gears, as the ECU loses synchronization.
For accurate diagnostics, it is necessary to use a diagnostic scanner, which will show not only the error code, but also the operating parameters of the sensor in real time. If the scanner does not see engine speed when cranking with the starter, the problem is definitely in the measurement circuit. In some cases, the error may be “floating” and disappear after the engine cools down, which complicates troubleshooting.
Visual inspection is also an important step. It is necessary to check the integrity of the wire insulation, the absence of signs of overheating and mechanical damage. The connector must be tightly secured and free of signs of oxidation or moisture. If you notice cracks in the sensor housing or traces of oil on its surface, this is a direct indication of the need for replacement.
- Engine won't start
- The car stalls while driving
- The tachometer is missing
- The error appeared accidentally
Step-by-step instructions for replacement and inspection
Replacing the crankshaft position sensor is a procedure that you can do yourself if you have the necessary tools and access to the work area. First you need to de-energize the car by removing the negative terminal from the battery. Next, locate the sensor, which is usually bolted to the cylinder block or transmission housing, depending on the engine model.
☑️ Preparation for replacement
Before installing a new sensor, be sure to clean the mounting area from dirt and oil. You can apply a thin layer of lubricant to the head of the new sensor to prevent it from sticking to the surface. Install the sensor and tighten the mounting bolt to the recommended torque. Do not overtighten it, as the sensor body may crack, causing further failure.
After assembly, it is necessary to check the operation of the engine. If the error disappears and the car starts the first time, then the problem has been solved. If the error returns, you need to delve into the wiring diagnostics and check the resistance of the sensor itself with a multimeter. The resistance value must correspond to the technical specifications specified in the service book.
Checking the sensor resistance
Connect a multimeter to the sensor contacts. Normal resistance is usually in the range of 500 to 1500 ohms, but the exact values vary depending on the vehicle model. If the resistance is infinite or zero, the sensor is faulty.
Table of sensor characteristics for different models
Below is a table with approximate sensor parameters for popular models Nissan. This data will help you choose the right replacement or check the original part. Please note that specifications may vary slightly depending on the year of vehicle.
| Car model | Engine | Resistance (Ohm) | Location |
|---|---|---|---|
| Nissan Qashqai | MR20DE | 600-1200 | To the right of the engine |
| Nissan X-Trail | QR25DE | 800-1400 | On the gearbox housing |
| Nissan Teana | VQ25DE | 700-1300 | Front of the engine |
| Nissan Almera | H4M | 550-1100 | Bottom of the engine |
When choosing an analogue, it is important to pay attention to the manufacturer. Original sensors Nissan They are of high quality, but are not cheap. Good alternatives are offered by brands such as Denso, Schneider and NTK. Avoid buying cheap Chinese fakes, as their characteristics often do not correspond to the declared ones, which leads to unstable engine operation.
⚠️ Attention: When installing the sensor, make sure that there is no gap of more than 1-1.5 mm between its head and the ring gear. Excessive clearance will result in signal loss and P0335.
Wiring and ECU problems
If replacing the sensor does not help, the next step should be to thoroughly check the wiring. Often the wires rub against adjacent engine parts or break at bend points. Use a multimeter to check the continuity from the sensor connector to the ECU connector. A break in any of the three wires (power, ground, signal) will cause the P0335 code to appear.
It is also worth checking the condition of the contacts inside the connectors. Oxidation or corrosion can create high resistance, which the ECU interprets as a lack of signal. If you find damage to the insulation, insulate the damaged area with high-quality heat shrink or electrical tape, but it is better to replace the entire section of the harness.
In rare cases, the problem may be in the electronic control unit itself. The internal driver responsible for processing the signal from the sensor may fail. This happens when there is a power surge or moisture gets into the unit. ECU diagnostics require specialized equipment and are often carried out at specialized services.
Before replacing the sensor, take photographs of the location of the wires and connectors to avoid assembly errors. This is especially true for complex engines with dense packaging.
Prevention and recommendations
To avoid the occurrence of P0335 in the future, it is necessary to carry out regular vehicle maintenance. Keep the engine clean and change the oil promptly to avoid wear products getting into the sensor operating area. It is also a good idea to periodically check the condition of the wiring harness, especially in areas subject to vibration and heat.
Use only high-quality spare parts for repairs. Cheap sensors may fail after a few months of use, resulting in repeated costs. Focus on trusted brands and purchase spare parts from official dealers or large auto stores with a good reputation.
If you notice symptoms of a malfunction, do not delay diagnostics. Driving at variable speeds or periodically stopping the engine can lead to overheating and damage to other components. Fixing the problem in a timely manner will save you money and stress in the long run.
Regularly checking the wiring and cleanliness of the sensor is the key to stable operation of the ignition system and preventing synchronization errors.
FAQ: Frequently asked questions
Is it possible to get to the service center with error P0335?
The engine may run erratically or stall, making driving dangerous. If the car starts, you can drive, but it is better to immediately contact a service center.
How much does it cost to replace a sensor on a Nissan?
The cost of work varies from 1,500 to 4,000 rubles, depending on the complexity of access to the sensor and the car model.
Do I need to reset the error after replacing it?
In most cases, the error resets automatically after several engine starting cycles. If not, use a scanner to remove the code.
Could P0335 be a false alarm?
Yes, sometimes the error occurs due to a temporary ECU failure or poor contact. Try disconnecting the battery for 10 minutes and see if the error appears again.
Solving a code problem P0335 requires a careful approach and consistent actions. The main thing is not to panic and methodically check each element of the system. If you are not confident in your abilities, it is better to entrust the diagnosis to professionals to avoid unnecessary costs.
⚠️ Attention: It is critical to check the integrity of the crankshaft pulley ring gear before replacing the sensor, as mechanical tooth damage is a common cause of false diagnosis.